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Updated: Mar 12, 2026

Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
Terahertz tunable graphene Fano resonance
Xiaoyong He1, Fangting Lin, Feng Liu
1Department of Physics, Mathematics & Science College, Shanghai Normal University, No. 100 Guilin Road, Shanghai, 200234, People's Republic of China. Shanghai Key Lab for Astrophysics, No. 100 Guilin Road, Shanghai, 200234, People's Republic of China.
This study explores tunable Fano resonance in graphene double rings for terahertz applications. Adjusting the graphene Fermi level effectively modulates Fano peaks, showing promise for advanced plasmonic devices.
Area of Science:
- Physics
- Materials Science
- Electrical Engineering
Background:
- Graphene exhibits unique plasmonic properties in the terahertz (THz) regime.
- Fano resonance offers sharp spectral features desirable for device applications.
- Tunable control over plasmonic resonances is crucial for advanced optical devices.
Purpose of the Study:
- To theoretically investigate tunable Fano resonance in graphene circular double rings (DR) in the terahertz regime.
- To analyze the influence of graphene Fermi level and structural parameters on Fano resonance characteristics.
- To explore the potential of these structures for terahertz plasmonic devices.
Main Methods:
- Theoretical investigation of Fano resonance using graphene circular double rings on a SiO2/Si/polymer substrate.
- Simulation of terahertz wave interaction with graphene ribbons.
- Analysis of the effects of graphene Fermi level, gap distance, and operation frequency.
Main Results:
- Tunable Fano resonance was observed and investigated in the terahertz regime.
- Strong coupling between incident waves and graphene ribbons enabled efficient modulation of the Fano peak.
- Increasing the graphene Fermi level enhanced peak amplitude and shifted the resonant peak to higher frequencies.
- An amplitude modulation depth of approximately 30% was achieved by varying the Fermi level from 0.1 to 1.0 eV.
- Optimal gap distance for the double rings was found to be 8-12 μm, maximizing the figure of merit.
Conclusions:
- The tunable Fano resonance in graphene DR structures provides an effective mechanism for terahertz wave modulation.
- The demonstrated tunability through Fermi level adjustment is highly beneficial for developing novel graphene plasmonic devices.
- These findings support the development of advanced terahertz sensors and modulators.
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